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1,327 Matching Results
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Hard Scattering And A Diffractive Trigger
Conclusions concerning the properties of hard scattering in diffractively produced systems are summarized. One motivation for studying diffractive hard scattering is to investigate the interface between Regge theory and perturbative QCD. Another is to see whether diffractive triggering can result in an improvement in the signal-to-background ratio of measurements of production of very heavy quarks. 5 refs. (LEW)
Date:
February 1, 1986
Creator:
Berger, Edmond L.; Collins, John C.; Soper, Davison E. & Sterman, George
Object Type:
Article
System:
The UNT Digital Library
Blaze: the intimate vision of feminism - Volume 2, Number 2, February 1986
A serial titled, Blaze: the intimate vision of feminism, Volume 2, Number 2 and published in February 1986.
Date:
February 1986
Creator:
Berman, Linda
Object Type:
Pamphlet
System:
The UNT Digital Library
Theory of energetic trapped particle-induced resistive interchange-ballooning modes
A theory describing the influence of energetic trapped particles on resistive interchange-ballooning modes in tokamaks is presented. It is shown that a population of hot particles trapped in the region of adverse curvature can resonantly interact with and destabilize the resistive interchange mode, which is stable in their absence because of favorable average curvature. The mode is different from the usual resistive interchange mode not only in its destabilization mechanism, but also in that it has a real component to its frequency comparable to the precessional drift frequency of the rapidly circulating energetic species. Corresponding growth rate and threshold conditions for this trapped-particle-driven instability are derived and finite banana width effects are shown to have a stabilizing effect on the mode. Finally, the ballooning/tearing dispersion relation is generalized to include hot particles, so that both the ideal and the resistive modes are derivable in the appropriate limits. 23 refs., 7 figs.
Date:
February 1, 1986
Creator:
Biglari, H. & Chen, L.
Object Type:
Report
System:
The UNT Digital Library
Collapse of Defect Cascades to Dislocation Loops in Cu3Au
TEM and ordered Cu/sub 3/Au were employed to measure the probability of dislocation loop formation as functions of irradiating ion mass (Ar/sup +/, Cu/sup +/ and Kr/sup +/), energy (50 and 100 keV), and irradiation temperature (30 and 300/sup 0/K). Disordered zones were produced at every defect cascade site and imaged in dark-field superlattice reflections. Dislocation loops were imaged in fundamental reflections in the same sample areas to produce an accurate measurement of the probability of the collapse of each cascade to a dislocation loop, within a large set (approx.200) of defect cascades for each irradiation condition. The size distributions of dislocation loops and disordered zones were also measured. Defect cascades collapse to dislocation loops with significant probability (approx.0.5) even at 30/sup 0/K. Other observations include an increasing collapse probability with increasing cascade energy density (increasing ion mass) and with increasing sample irradiation temperature. However, no additional collapse was observed upon annealing from 30 to 300/sup 0/K, and no increase in collapse probability was observed upon increasing the bombarding ion energy from 50 to 100 keV. Disordered zone sizes also increased with increasing ion mass and with increasing sample irradiation temperature (30 to 300/sup 0/K).
Date:
February 1, 1986
Creator:
Black, T. J.; Jenkins, M. L.; English, C. A. & Kirk, M. A.
Object Type:
Article
System:
The UNT Digital Library
The Colony Courier (The Colony, Tex.), Vol. 10, No. 25, Ed. 1 Thursday, February 6, 1986
Weekly newspaper from The Colony, Texas that includes local news along with advertising.
Date:
February 6, 1986
Creator:
Blalock, Jack
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier (The Colony, Tex.), Vol. 10, No. 26, Ed. 1 Thursday, February 13, 1986
Weekly newspaper from The Colony, Texas that includes local news along with advertising.
Date:
February 13, 1986
Creator:
Blalock, Jack
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier (The Colony, Tex.), Vol. 10, No. 27, Ed. 1 Thursday, February 20, 1986
Weekly newspaper from The Colony, Texas that includes local news along with advertising.
Date:
February 20, 1986
Creator:
Blalock, Jack
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier (The Colony, Tex.), Vol. 10, No. 28, Ed. 1 Thursday, February 27, 1986
Weekly newspaper from The Colony, Texas that includes local news along with advertising.
Date:
February 27, 1986
Creator:
Blalock, Jack
Object Type:
Newspaper
System:
The Portal to Texas History
Bowing of solid breeder fuel pins and multiplier rods in a pin-type fusion blanket
The most important outcome of this bowing analysis is the determination of the number of internal breeder rod supports required for good thermal performance. Although many effects were considered, the swelling deformations were the most restrictive in terms of the peak deflections. It appears that three internal supports should be sufficient to keep the rod bowing below acceptable levels without significantly raising the structure-to-breeder ratio. The most severe interaction problem involved the last multiplier row and the first breeder row. Because the Be rods deflect very little, this problem can be alleviated by leaving enough space between these two zones. The spacing can be tighter elsewhere. A more detailed analysis of the multiplier rod bowing caused by the damage gradient must be analyzed before this can be verified.
Date:
February 1, 1986
Creator:
Blanchard, J. P. & Ghoniem, N. M.
Object Type:
Report
System:
The UNT Digital Library
Thermomechanical analysis of solid breeders in sphere-pac, plate, and pellet configurations
The first configuration studied is called sphere-pac. It features small breeder spheres of three different diameters, thus allowing efficient packing and minimal void fraction. The concept originated as an attempt to minimize thermal stresses in the breeder and improve the predictability of the breeder-structure interface heat conduction. In general the breeder is made as thin as possible, to maximize the breeding ratio, so the cladding's integrity will likely be the life-limiting issue of this concept. The third breeder configuration is in the form of pellets cladded by steel tubes. The major thermomechanical issue of the pin-type designs is cracking, which would impair the thermal performance of the blanket. Fortunately, the pins can be sized to prevent cracking under normal operation. In this report we have treated each blanket generically, dealing with basic issues rather than design specifics. Our basic philosophy is to avoid cracking of the breeder if at all possible. It can be argued that cracking could be allowed, but this would sacrifice predictability of the blanket thermal performance and tritium release characteristics. Proper design can and should minimize breeder cracking.
Date:
February 1, 1986
Creator:
Blanchard, J. P. & Ghoniem, N. M.
Object Type:
Report
System:
The UNT Digital Library
Long-term Changes in the Sensitivity of Quadrupole Mass Spectrometers
We routinely use quadrupole mass spectrometers (QMS) to monitor vacuum conditions, gas purity, and plasma-wall interactions in the Tokamak Fusion Test Reactor (TFTR) at Princeton. Two QMS systems have been operating on TFTR continuously for a two-year period. Both QMS systems are absolutely calibrated at weekly intervals using a six-part standard gas mixture. The calibration procedure is based on the use of transfer standards (ion gauge and capacitance manometer) that are calibrated against a primary standard (spinning rotor gauge) on an external vacuum system. We have identified variations in the efficiency of the QMS ionizer and drifts in the sensitivity of the electron multiplier ion detector to be the major reasons for the observed changes in overall OMS sensitivity. Weekly variations in sensitivity greater than 100% have been observed following system bakeout at 150/sup 0/C and with the use of rhenium filaments which were initially in the QMS ionizer. Operation of the QMS systems with tungsten filaments and at constant temperature has yielded more stable operation with weekly sensitivity changes generally being less than 10%. 7 refs., 7 figs.
Date:
February 1, 1986
Creator:
Blanchard, W.R.; McCarthy, P.J.; Dylla, H.F.; LaMarche, P.H. & Simpkins, J.E.
Object Type:
Article
System:
The UNT Digital Library
Tritium in the aquatic environment
Tritium is of environmental importance because it is released from nuclear facilities in relatively large quantities and because it has a half life of 12.26 y. Most of the tritium released into the atmosphere eventually reaches the aqueous environment, where it is rapidly taken up by aquatic organisms. This paper reviews the current literature on tritium in the aquatic environment. Conclusions from the review, which covered studies of algae, aquatic macrophytes, invertebrates, fish, and the food chain, were that aquatic organisms incorporate tritium into their tissue-free water very rapidly and reach concentrations near those of the external medium. The rate at which tritium from tritiated water is incorporated into the organic matter of cells is slower than the rate of its incorporation into the tissue-free water. If organisms consume tritiated food, incorporation of tritium into the organic matter is faster, and a higher tritium concentration is reached than when the organisms are exposed to only tritiated water alone. Incorporation of tritium bound to molecules into the organic matter depends on the chemical form of the ''carrier'' molecule. No evidence was found that biomagnification of tritium occurs at higher trophic levels. Radiation doses from tritium releases to large populations of humans …
Date:
February 1, 1986
Creator:
Blaylock, B.G.; Hoffman, F.O. & Frank, M.L.
Object Type:
Article
System:
The UNT Digital Library
Effects of non-condensible gases on fluid recovery in fractured geothermal reservoirs
Numerical simulations are performed in order to investigate the effects of noncondensible gases (CO/sub 2/) on fluid recovery and matrix depletion in fractured geothermal reservoirs. The model used is that of a well producing at a constant bottomhole pressure from a two-phase fractured reservoir. The results obtained have received a complex fracture-matrix interaction due to the thermodynamics of H/sub 2/O-CO/sub 2/ mixtures. Although the matrix initially contributes fluids (liquid and gas) to the fractures, later on, the flow directions reverse and the fractures backflow fluids into the matrix. The amount of backflow depends primarily upon the flowing gas saturation in the fractures; the lower the flowing gas saturation in the fractures the more backflow. It is shown that the recoverable fluid reserves depend strongly on the amount of CO/sub 2/ present in the reservoir system.
Date:
February 1, 1986
Creator:
Bodvarsson, G.S. & Gaulke, S.
Object Type:
Article
System:
The UNT Digital Library
Proceedings of the nineteenth LAMPF Users Group meeting
Separate abstracts were prepared for eight invited talks on various aspects of nuclear and particle physics as well as status reports on LAMPF and discussions of upgrade options. Also included in these proceedings are the minutes of the working groups for: energetic pion channel and spectrometer; high resolution spectrometer; high energy pion channel; neutron facilities; low-energy pion work; nucleon physics laboratory; stopped muon physics; solid state physics and material science; nuclear chemistry; and computing facilities. Recent LAMPF proposals are also briefly summarized. (LEW)
Date:
February 1, 1986
Creator:
Bradbury, J.N. (comp.)
Object Type:
Article
System:
The UNT Digital Library
Structure of tris(trimethylsilylcyclopentadienyl)uranium(III), ((CH/sub 3/)/sub 3/SiC/sub 5/H/sub 43/U. [Tris(trimethylsilylcyclopentadienyl)uranium]
Crystals of ((CH/sub 3/)/sub 3/SiC/sub 5/H/sub 4/)/sub 3/U are orthorhombic, Pbca, with a = 22.630(8), b = 29.177(10) and c = 8.428(3) A at 23/sup 0/C. For Z = 8 the calculated density is 1.551 g/cm/sup 3/. The structure was refined by full-matrix least-squares to a conventional R factor of 0.041 (2251 data, F/sup 2/ > 2 sigma(F/sup 2/)). The uranium atom is bonded to the three cyclopentadienyl rings in a pentahapto fashion and is in the plane of the ring centroids. The U to ring distances are 2.54, 2.47 and 2.51 A, and the average U-C distance is 2.78 +- 0.04 A. 7 refs., 1 fig., 3 tabs.
Date:
February 1, 1986
Creator:
Brennan, J.; Andersen, R. A. & Zalkin, A.
Object Type:
Report
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 92, No. 39, Ed. 1 Thursday, February 6, 1986
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 6, 1986
Creator:
Bridges, G. Frank
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 92, No. 40, Ed. 1 Thursday, February 13, 1986
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 13, 1986
Creator:
Bridges, G. Frank
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 92, No. 41, Ed. 1 Thursday, February 20, 1986
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 20, 1986
Creator:
Bridges, G. Frank
Object Type:
Newspaper
System:
The Portal to Texas History
Scintillation techniques and optical devices: summary report of the working group
Use of optical fiber techniques particularly in particle tracking is discussed. Fundamental aspects of scintillating tracking detectors using the fiber-optic waveguide are described, including candidate core materials, fiber manufacture, properties of the scintillation materials and waveguides, attenuation length, and radiation resistance. The general consensus is expressed that most of the basic building blocks needed for fiber detector readout exist but require optimization. Attention is given to the imaging system components, including image intensifiers, electronic cameras, and digitizing systems. Also of concern is the ability of scintillating fiber detectors to handle high rates due to their granularity. Requirements for triggering are given. Also discussed are tracking, photodiode devices, and calorimetry. (LEW)
Date:
February 1, 1986
Creator:
Bross, A. & Ruchti, R.
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 79, Ed. 1 Sunday, February 2, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 2, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 80, Ed. 1 Monday, February 3, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 3, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 81, Ed. 1 Tuesday, February 4, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 4, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 82, Ed. 1 Wednesday, February 5, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 5, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 83, Ed. 1 Thursday, February 6, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 6, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History